Well of the two the only one I can play efficiently without cheats is TNT. Plutonia can reasonably be deemed "Impossible", although I have played those levels also and they look cool if you can survive in them (I got to Map05 without cheats). TNT is good though, the level design, I think, can be compared to E1. The ambiance in the maps is excellent also, it makes you watch your step because anywhere you go could trip a wire unleashing annoying snipers and huge badasses.

TnT Eviluation by a long shot. Plutonia would be a lot better if it wasn't so hard.
TnT is nearly perfectly balanced, whereas Plutonia throws Arch-Viles, Cacodemons, Chaingunners, AND Pain Elementals at you from the very first level.

I wouldn't buy it myself, but if you don't have any actual Doom games, get it. If you already have Doom and Doom2 (or just Doom), don't even bother. There's nothing new in it that isn't in each of the original packages.

ah... but lifting it poses the same problem as buying it. no stores have it anymore. not even second hand ones. no one's dumb enough to sell their copy of id anthology anyway. doesn't matter to me, i have all of the games in the anthology (except maybe dangerous dave registered). Plus my Commander Keen 6 is vga, not cga like in anthology.

Plutonia is easily better. come on.
Xit is the first *player* that I have ever heard say that TNT was his preference.
Plutonia is more challenging; besides, I honestly feel that a lot of the TNT maps are UGLY. heh